(19)

(11)

EP 3 679 218 A1

(12)

(43) Date of publication: 15.07.2020 Bulletin 2020/29 (21) Application number: 18734449.4 (22) Date of filing: 11.06.2018

(51) International Patent Classification (IPC):  E21B 7/02(2006.01) (86) International application number: PCT/EP2018/065309 (87) International publication number: WO 2019/048093 (14.03.2019 Gazette 2019/11)

(84) Designated Contracting States: AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR Designated Extension States: BA ME Designated Validation States: KH MA MD TN (30) Priority: 08.09.2017 SE 1751089 (71) Applicant: Epiroc Rock Drills Aktiebolag 701 91 Örebro (SE)	(72) Inventors: SJÖHOLM, Oskar 702 18 Örebro (SE) ANDERSSON, Fredrik A. 702 31 Örebro (SE) KUMLIN, Per-Anders 421 39 Västra Frölunda (SE) ALMQVIST, Marcus 702 86 Örebro (SE)